Oxygen pump



FIG. 1 is a first perspective view of a oxygen pump showing my new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is atop view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines shown in the drawings depict portions of the oxygen pump in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a oxygen pump, as shown and described. 